host: add support for reading provisioning templates

[pnovotny]

Description of changes

Added new method nailgun.entities.Host::list_provisioning_templates
which returns all provisioning templates assigned to a host.

Upstream API documentation, plugin, or feature links

Local documentation via Satellite apidoc:

https://satellite.example.com/apidoc/v2/hosts/templates.en.html

Functional demonstration

Provide an execution of the modified code, with ipython code blocks or screen shots.
You can exercise the code as raw API calls or using any other method.

Your contribution should include updates to the unit tests, covering the modified portions or adding new coverage.

Example:

In [1]: from nailgun.entities import Host
In [2]: host = Host(host='sat.instance.addr.com', id='snap_uuid').read()
In [3]: print([template['name'] for template in host.list_provisioning_templates()])
Out [3]: ['Kickstart default finish', 'Linux host_init_config default', ...]

Additional Information

N/A

[codecov-commenter]

Codecov Report

Patch coverage: 23.07% and project coverage change: -0.28 ⚠️

Comparison is base (905eb11) 93.35% compared to head (6363e91) 93.07%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #910      +/-   ##
==========================================
- Coverage   93.35%   93.07%   -0.28%     
==========================================
  Files           6        6              
  Lines        2933     2945      +12     
==========================================
+ Hits         2738     2741       +3     
- Misses        195      204       +9     

Impacted Files	Coverage Δ
nailgun/entities.py	92.32% <23.07%> (-0.36%)	⬇️

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[sambible]

ack pending PRT run on main PR